which is a \(3.3 \sigma \)  discrepancy from the SM prediction [1]}. Combined with the previous E821 experiment at BNL [2]}, the result leads to a \(4.2 \sigma \)  discrepancy [1]}
\(\Delta a_\mu = a_\mu ^{\text{FNAL}+\text{BNL}} - a_\mu ^{\text{SM}} = (251 \pm 59) \times 10^{-11}.\) 
